BACTERIA TRENDS REPORT

Technical Committee MeetingOctober 6-7, 2015Agenda Item #9

HISTORYOn April 19, 1994 the CSO Policy was published and for decades Municipalities along the Ohio River have been trying to meet the Nine Minimum Controls and develop Long Term Control Plans. Municipalities have spent millions of dollars to achieve compliance with the Clean Water Act and meet Water Quality Standards. ORSANCO plans to use the historical bacteria data to look for possible trends at the six major CSO communities along the Ohio River where contact recreation sampling has taken place.

Fecal Coliform Data Timeline• During 1992-1994 there was a single site sampled May thru October at six major CSO communities along the Ohio River. All of the sites except for Pittsburgh had a sampling frequency of five samples a month to produce a Geometric Mean.

• In 2000, sites were added to include an upstream, downtown, and downstream sample in each CSO community. Pittsburgh also began a sampling frequency of five samples a month.

• In 2009, one site was dropped at each of the CSO communities and Colilert sampling began in Cincinnati.

• In 2013 the month of April was added to the sampling plan.

Site Fecal E.coli1.4L 2001-2009 2001-20091.4M 2001-2014 2001-20141.4R 2001-2009 2001-20094.3 1994-2014 2000-2014

84.2 2006-2009 2006-200986.8 2001-2014 2001-201491.4 2001-2009 2001-200992.8 1992-2014 2000-2014

305.1 2001-2014 2001-2014308.1 2001-2009 2001-2009314.8 1992-2014 1993-2014462.6 2001-2014 2001-2014463.9 2007-2011 2007-2011469.9 2007-2011 2007-2011470 2001-2014 2001-2014

477.5 1992-2014 1992-2014594 2001-2014 2001-2014

608.7 2001-2009 2001-2009619.3 1994-2014 1994-2014626 1992-1993 1992-1993

791.5 2001-2014 2001-2014793.7 2001-2014 2001-2014797.3 1992-2009 1992-2009937.9 1992-1993 1992-1993

Site Years of Data with Fecal Years of Data with E.coli1.4L 9 91.4M 14 141.4R 9 94.3 21 15

84.2 4 486.8 14 1491.4 9 992.8 23 15

305.1 14 14308.1 9 9314.8 23 22462.6 14 14463.9 5 5469.9 5 5470 14 14

477.5 23 23594 14 14

608.7 9 9619.3 21 21626 2 2

791.5 14 14793.7 14 14797.3 18 18937.9 2 2

Contact Recreation Sites

Project Objectives

• Evaluate the temporal traits in the six CSO communities

• Compare the upstream sites to the downstream sites

• Look at previous fecal coliform trends assessment done in 1983 and compare with current assessment

• Use flow/precipitation to show possible seasonal trends

n=49652% above 400

% Violation of WQS

WQS

52%

38%

23% 23%

36%

24%

n=496 n=70

9

n=708n=742

n=705n=519

1995-1999

2000-2004

2005-2009 2010-2014

1995-1999 2000-2004 2005-2009 2010-2014

1995-1999

2000-2004 2005-2009 2010-2014

1995-1999

2000-2004

2005-2009

2010-2014

1994-1999 2000-2004

2005-2009

2010-2014

1995-1999

2000-2004 2005-2009